Hi Kent. It could be an RFI issue but it could also be a faulty connection somewhere that won't pass enough current for high power.
Do the KPS's SWR LEDs light up like a Christmas tree when you operate barefoot at about 100W with the KPA in standby? If so, you clearly have a problem with your antenna or feed. With the KPA in operate mode, watch those SWR LEDs as you gradually increase the drive from 5 to 25W: if it seems OK at the low end but suddenly flashes the oranges/reds and faults out, I'd suspect a dodgy connector, most likely one outside that has corroded or loosened. 73 Gary ZL2iFB K2 K3 KPA500 W2 Mojo PS You can search the archives for lots more through Nabble e.g. http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=search_p age&node=365791&query=kpa+swr > -----Original Message----- > From: [email protected] [mailto:elecraft- > [email protected]] On Behalf Of Kent Tiburski > Sent: Sunday, 10 June 2012 1:33 p.m. > To: [email protected] > Subject: [Elecraft] KPA500 Issues > > Hi, > > I have a KPA500 amp and have some issues with it. I ran on my Cushraft R-8 > vertical with fault (SWR) problems. I went to use it on the VHF contest with > my meager 3 element yagi and it faults out? Hunhh? Checked the VSWR > with a meter and my antenna analyzer and it shows a 1.2 to 1 ratio. OK I > thought there was feedback so I put a bunch of ferrite cores and even > wrapped 8 turns on the coax (balun) to no avail. What gives? This was mainly > on 6 meters but to some extent on other bands also. Checked VSWR with a > meter on radio (FLEX 5000A). I think it's in KPA500 circuit. Any ideas? I'm a > newbie here so not familiar with what's been discussed. Thanks. > > 73, Kent, K6FQ > > __________________________________________________________ > ____ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
